Just weeks before the planned first flight of a fully outfitted KC-46 Air Force tanker, the plane’s fueling system has been damaged by a chemical mix-up, temporarily grounding the jet. Meanwhile, Boeing put veteran executive Scott Fancher in charge of the troubled tanker program.

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CAPE CANAVERAL, Fla. (AP) — NASA is offering up wreckage from the Challenger and Columbia for public view after hiding it from the world for decades. A new exhibit at Kennedy Space Center features two pieces of debris, one from each lost shuttle, as well as poignant, personal reminders of the 14 astronauts killed in...